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Question 1

Make a sketch of the human nerve cell. What function do nerve cells perform?

Solution:


Function of a nerve cell: The nerve cell receives and transfers messages, thereby helping to control and coordinate the working of different parts of the body.

 

Question 2

Write short notes on the following:

 

(b) Nucleus of a cell

Location – Located in the centre of the cell

Shape - Spherical in shape

Structure

  • Nucleus is separated from the cytoplasm by a nuclear membrane

  • Nuclear membrane is porous in nature to this property it allows the movement of materials from cytoplasm to the nucleus

  • Spherical body in the nucleus is called as nucleolus

  • Nucleus contains thread like structure called as chromosomes

  • These chromosome contain genes

  • Genes is a unit of inheritance in living organism

  • Inheritances is the transfer of parental characters to the off springs

  • Solution:

    (a) Cytoplasm

  • Cytoplasm is the fluid that fills a cell

  • This fluid is present between the cell membrane and the nucleus

  • Organelles of cell are present inside the cytoplasm
     

  • Question 3

    Which part of the cell contains organelles?


    Solution:
    Cell Organelles are present inside the cytoplasm of the cell.
     

    Question 4

    Make sketches of animal and plant cells. State three differences between them.

    Solution:


    Differences between plant cell & animal cell:

     

    S. No

    Parts

    Plant cell

    Animal cell

    1

    Cell Membrane

    Present

    Present

    2

    Cell Wall

    Present

    Absent

    3

    Nucleus

    Present

    Present

    4

    Nuclear Membrane

    Present

    Present

    5

    Cytoplasm

    Present

    Present

    6

    Plastids

    Present

    Absent

    Question 5

    State the difference between eukaryotes and prokaryotes.

    Solution:
    S. No Eukaryotes Prokaryotes
    1

    eukaryotic cell

    (Eu–true,karyon – nucleus)

    prokaryotic cell

    (pro - primitive, karyon – nucleus)

    2 The cells with well organized nucleus with a nuclear membrane are termed as eukaryotic cell These cells have nuclear material but they are without nuclear membrane are termed as prokaryotic cell

    Question 6

    Where are chromosomes found in a cell? State their function.

    Solution:
  • Chromosomes are present in the Nucleus.

  • Genes is a unit of inheritance in living organism.

  • Inheritances is the transfer to parental characters to the off springs.

  • Question 7

    ‘Cells are the basic structural units of living organisms’.

    Solution:
    • Cells in the living organisms are basic structural units. In the living world, organisms.

    • Differ from one another but all are made up of cells. Cells in the living organisms are complex living structures.

    Question 8

    Explain why chloroplasts are found only in plant cells?

     

    Solution:
  • Chloroplasts are the "site" of photosynthesis. It is green in color as it has chlorophyll pigment.

  • Chlorophyll pigments give green color to the leaves.





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